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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45760daf8d4dff15c1b3337435f44cacbdeef2bc1a7fc7703739ec9f2c45f4aa' 
  AND token = '3WJ1l6biAd2j3MBVVzXXCkAo1bqNQXywKOy+FnlALjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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