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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9059efe64aa4fe47c066c1cb01e39c7800ff0523961b6382c226f0e6463e8a' 
  AND token = 'uonY85xAAnXFd7Vl5yg4RNmhqoJwVxW3887W1azH40s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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