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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba862ac4260c3321c16885d0036821a89a2a15c8c547735923f7bef613c06250' 
  AND token = 'hSxGnE6tqucixyur8TqUCRgIL/Rm9r/boYRxoPBeUno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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