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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a3746f47550fbce8869041d7fa413d958f3bdf900b15851f178e9f1b02cd78' 
  AND token = 'YFrEuLSuATsiQIvHZaITinQILrhQLUsqILmZQ3w/xrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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