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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fbbc4821f3595c7b79ed1bf54e366d833b54a24c32735d64050f797909ff08' 
  AND token = 'eDCk+bRT+gNFeIiIYOWj5eGTvyL3l3kNvNQGFGi8fWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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