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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ca7af6a4bebd3c59a046c0666384c93ce7ee4262a9f7c68c43a50498c29baa' 
  AND token = 'UU7gM9As/94APYDwxJPnc8aq8MDxOXJyUfJPTeeEtmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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