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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed66b858fd36ce6348d13a2573a14f9de3f924db666eb8769f3f2592f3552500' 
  AND token = 'VRrOGHrNvITpF0Jaurj8+H2m+TI3Dj/6Mlhs3mhxx70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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