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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f57136b003b38a896b5a803b89566f740d4d61d9a9f126d7bca2b012fc4f3d' 
  AND token = 'H07lswhgo7xZLrmercLD65zyv/wZw5SZBL31/8amnsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}