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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079061d3d7b3c52b92690f6453bd956534742f71d7536e0a349a43ce3d3eb385' 
  AND token = 'AmmbmkQjLyHy/+tmY3AV1MmDNU6VLM/oDQ2z2SFRrrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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