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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c1127344d548454338c6d04b57a5ac1fb861927dd6f6efa75ebf3f1d56699c4' 
  AND token = 'YQ3b4XzzTLx8rslvUuFCMVg1ccTw0P4+78Mr4er8Vs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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