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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9656326c599ea0f42f6715df5663080d998acc4763bc129e0938d09b7e497e3' 
  AND token = 'ihc4KX/yK1ezpB3SriCvnozDx7F8TiEFbMFzWt2+waE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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