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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6efa1d4d0c2d0eeff2555394a2c6a95fb26f670c512ba4e1746db349b8410b79' 
  AND token = 'xwDlLKmJ/slE4eJRUteNdI0++GaxaTqPURFdh+SEGcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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