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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '081014a243abc16c5e2944622bb0d071cc3044d10c1679593c8f3be285d8bcf5' 
  AND token = '8xP7ozi5+8pshidPWBTgHP8gaSnnrhaSm9q/q+tqxvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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