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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a48fecd10ae9a2acca303ee4996652985ef954c9a581f2054a70db8a472c878' 
  AND token = 'i5dyq3AenwvwVhZDtgGAr2SuwOBXffAxqODxct3jpmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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