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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4555ae647ab603bc26519d08e96a473b63d863fd378172271b657ca3fe552d9e' 
  AND token = '2x2n10jH1KBt0h/M/yp3favKU58X7m1xnSprw32D1is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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