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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347a9f68971599a1d4de9af177c445a7dfe1ac830d2e244911b454c252d4f765' 
  AND token = '6ILImcVAJjW4s7sG6qBKhC8gi6MNsl9vme1FCK9LJ10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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