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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c022cfc21f7cd948e11c6f34ac1ee54b8addf84a5be870e5d221fd285c7c9b' 
  AND token = '8tsEc6JgIgLzMK6vBHhnGtMtKIv4VDlkMbcpFkE8bE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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