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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9243919427e74a3dec8676571bd2c83a10ce6ef41394a88f640f2f6f2402dc7b' 
  AND token = 'PvPW9CEzdbuHsqh+J0Ur9qE6w3bipBdaXd93SFJdihM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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