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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c8d8444fdc22abc3176a44c93fea46cbecd86566bc8acfaf3640a79b3b698e' 
  AND token = 'zbMNoNgS2wj46yXVPz7YIJeeEI7IFRcIlwvw/AqMVzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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