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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ecc4e30a9b6f4f6779918f44d867d9befe5fc1dda81fdeb3bfd256cccb9c86' 
  AND token = '/1Ugf8964ODSWaBzSNoG+51EJgWM+Dux23DlPlKRxVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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