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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2cc678fc55df1298be2b31f85981c386b0bf705f2b90e0bea2ebc3d15f6c41' 
  AND token = '5piQSs5bNMMq6Fe0dcYOEoxpzaL3e7N16QesgXj+kGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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