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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce20b00f73187e3b963d0bbcf9d53ddd362ab4fc415a8d0c05642496584ade6' 
  AND token = 'VWXt43D3TuVKyYi9egQGYaom/hp0BcNWSnTx0zCWnlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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