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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0546e6fd3e9ef4b5906db6319b3e453115f1b8d397356c9c05fa6a24d330d7d2' 
  AND token = 'NU5u3RYqrL2S7DN0Nyp1qzi9VJ4cS8FuAaeKh8l+ZgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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