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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd553889a5a229f6959850e5672b2ad818ec8f9a5b9a1a17bb541e10a5e1e6a10' 
  AND token = '36IdS5sB08d9P+Uhz3BIE0GH8fg47s9FdS5BtopPe4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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