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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30a8abf1ac5b9a9eb75f5cd54fbbadaf4f0a450d5577ce7c3abe4216273ba4a' 
  AND token = 'eOl4p0LzN2YwByjgdnvESSUjpOrOf8cFFn3qiBch7v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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