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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b704932b65debc2edd49da950df47967e4716992dbf8be8c5e1052f9d9f06344' 
  AND token = 'GOD1zY67N/NHlOkXXUzSjdIBWn3iD2v94bGiaZuVRKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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