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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d0dce55aca2577434a00238488a998066b76606e084e8b170dc5a16c55e546' 
  AND token = '9Jh1rddfXH0LAbKN+4HIsbLkoEao6qFrjZ+jtWA+HII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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