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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a008d8a2d29490c6e00cede125f83e763fd4105d165d99f82dfe7e4b8573ece' 
  AND token = 'cwhSez6gNfCOrX6QIisiJuTp6IiONlpsSDDt95ePH9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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