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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bea6dff629e2a3d374371494e4dace256c42784429d49493df45fac58e6e9c1' 
  AND token = 'RJW5xbhEhMQhIq3hZS0aal5OjpJBbtC80dpSzeMzoTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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