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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f53783e7a701ca13ddb4144a99c4656e7ccef32c1bfae7f540c0f42e2a3c8f' 
  AND token = 'bI0lKBlk7DXmMVEP9eB3iEaueV3ahD8FyJF7c1ZOsKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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