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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f10dd2bb8915bfebda40f7f870fb07da132c1d7e3ef608d07d000929711bdd27' 
  AND token = 'bLW7STN6tWYXh/j24Rew370h2qDf8+32AjbQqxjI+cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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