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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c1ad781b038268057df0bcc5fb5116677373b37e3d42e30e4d401db917afa4' 
  AND token = 'f1if64RsRFO9nQ/wOGQYRqDEPnoVsG+xeJfpm0bX+xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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