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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259adbb6d9129799adf6879025dcad5985fe2ad51b754c67d575920592cddb97' 
  AND token = 'ydQrzby5uNKDYgZHj6Kh9O7HZ6kGSLFIprgi0F0dK6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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