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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7a447c63b1e587b1d621fa066abfc6627e5140aed91d17797861b26713b71d' 
  AND token = '4MZRyWNvot/Sti3u+tdR6oyntBOJ3nHK9+mhNy1XSjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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