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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d39a6e0dc739e91397e09f4dc8706cd2c4f42950cdd961a21c9ed6e9e4a965' 
  AND token = 'sfQRrrjp9c4BbvZCswgaFp53KE2yPSX08dI+uOSt3/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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