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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67370890d5fb6c353f775e3e0620bbeeb8bd3ea2dc1abdc4884d53b94bfaa62f' 
  AND token = 'rb4zNx8vSgZtjZMuCszx4Gh7x6Epgk2CinjgGiqN2fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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