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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0084cb4194937d1b3e1a8c21d7053543cfa443f6c0857dc3df26d37b55d46f3' 
  AND token = '2vpDQjOL5XSzmYFUM8mwWV26XXwsArMws/GtfRaXl3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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