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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde14f2cb287f4e77098df75fa9cf36c69d75cec7af35752f0ddcfc706dbb62e' 
  AND token = 'gDfaYfWQXkcf8U6boBtbVjE2iSIQ9ZB38pLOdEcBZf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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