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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2542f7ad9dca45b34ece5290840c793c83c120f2de5e2c698e7d51a15a063406' 
  AND token = 'wEGz+T8xu/QBzhCF8Efhu+h16ZyYerRxwoe4dPoWgH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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