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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd15c7de19cf91260279bce755c04f68272c995d55088303c470a9508c2939ce' 
  AND token = 'IHFndLLgngVe9BLLkjhGHA5la475O9lHp8lsGJNFv9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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