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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1508b325418a55eb2ff5106fb9f63f03f473700c8f6361690e030532deb4f1d0' 
  AND token = 'CGk2WsR5tur0eHoD//JbDzQqnB9dXQgvO6ala8ymTcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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