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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91d21d87dc3c36813bccf31cdff8e9f6fe9b78edd3205466285df5743b35874' 
  AND token = 'DlxIfkoo5ZmicInrcuPAqnTIMMOGOTGxROtFcTqGUTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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