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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c10dc5a16165365e05d45f09000b875e540d1ee74bb1efd2e167babac8619d' 
  AND token = 'KjVP+SDB4LmbGBHY0KzekID59G1rmy3ne1mrPZQz9Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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