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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30717ee8782828e08eab59ed1434abfc430adb0a4b980bbf5ca0d32cab6ff8e8' 
  AND token = 'brT9xlo0bDhKiQVzrjE08R+/tGaVfGIJK2Pl52jGCAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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