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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1d14ab21328207a4628c20628d7dee69a0a672f659e30d516eb3861c6ea24d' 
  AND token = 'etbYZdnPG8a28Q9ejzQtGSJlnQdJQmFA3CffB6pAlI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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