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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8431e6ce8911b8f382f3bc10718686e1e47ca1bbd74c69d0c31ce6917cdf93f' 
  AND token = 'CE9abroVzEVc9+RA/PhNmE/H3DDU7xsxexNy7jT31pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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