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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9863e3714163b41b20200a912f33a05aaf45c4ca5b0bced1b563e3e830e425' 
  AND token = 'zN9gPOmyjFJmFDz51Tj6vT3kFxMsj++XuJ6sbP8/674=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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