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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1511fc7b87c6bdcf5f0fef2acc9ae77cb9740b169e109717851d437291b706' 
  AND token = 'dQLQqqITkvkGSD4n5iWC8lN0Os1FJvkdz2o27Tow0Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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