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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4074c4e2dc53bd80812a4b455fc3eacdd441350e409dc57e2c2c402ffbe814d' 
  AND token = 'iLP6CD3uAK4N7u5w2mJMFnaWGngOn1hdAP08pYADBpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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