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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037f92f92b4f1e4ce94498279747cf948c3c1616e8315ee1920094cf6d796735' 
  AND token = 'OA9Mh6BL+0PX3h8vykJQosMVzEiBM0zjRxisP6vKBSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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