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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79704bf6cb21d2b6d79e36f4c0e158d575b5c6f9e0452768588105aa865bf654' 
  AND token = '2NlfefFmS8GgdF1+HlCPuJxcUMIiBXOy3H/3wXp4Wok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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