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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a6792f8886e02c4e7bbeb7813f05f2ffe378cf7c65932b5c22ca217fae96dd' 
  AND token = 'Dg+R/+kbs9fuBtVYh9Ydwif0Ufkh9p8KiO6YcSNg4CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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