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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb89b412ff18e435f0e85f2becb81f616e58af7b4bc22bf4289d1f3285ff96ba' 
  AND token = 'PAfR3R+70qfgJYD8T/V0JIOIs8EkWjmJqp51WIvFnaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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