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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8a4ecd71af7820fdf80dd2c56450544ec57172e443df08149f49bcf3c5cdee' 
  AND token = 'xP0+e3D2iwmEut12cM+BkmwgE6ngHnj5HSFYnHqwqpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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