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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c551d9e8978c6b6e8f94f178d2d1a2961f35b60e3d9791326f7a521b67a61bda' 
  AND token = 'gIlpwqQODMFyryfrjmYO8Hp5ZkpONX6odc0b/+QfJ9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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