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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb2adf16233ef3a42eeac1ac62ee3c963f9f3a9f1b1059adb2f740101241520' 
  AND token = 'Eg89a98jkqjJNJv196n0e6uOl/AW3h8s1qdHgbMqjzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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