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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc669b17d8f90536486e5653872ab2112811b73bdd5f22cbe809e43356b7fb3' 
  AND token = 'kPwF0mjONMRZlQuQP0RsYRPT3C2C58gzE2cUWmwDncg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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