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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f09bcff1ea6671ddfe9a4b7d04ba172ae7381d9df0a297a60a9a9269d2006b' 
  AND token = 'hd86DPWqInrzAwJ/BTXWnLy3Gls3HykRVeqLWYGEwwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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