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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5ec47ff23dc93f1284a4d13c2c59b61036b86611be444ba863d3b33cfd6731' 
  AND token = 'XtRs+6PXbDCq7cJMoLtFGy75/ByHo3p6QRYcULvBWDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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