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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c9a916d6ef96e42d6a5db9aa36a1f9bf3b39504db531b6e6ec81e69f346cd2' 
  AND token = 'CItB3LAN4tTHBkIscBcv9K4OtPNGN9JuHPeRR+/xmbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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