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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f4d6ad15e3d3fc9d77e91a37a5ee0352fbc86c71a4b4f31bed770e07abec36a' 
  AND token = 'Utw94AzVAEpO7qaRaiW4f7oI1UbhkZEecOmNvHLd5wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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